The Washington Shelby Club has a track day in the fall at SIR.
http://www.wasaac.org
The Northwest Shelby Club has several events at PIR
http://www.SAACNW.org
Mustangs NW have one event.
http://www.mustangsnorthwest.com
I've also run with the NW Alfa Club and Ferrari Club. The Porsche Club is hit or miss as they have huge turnouts at their events. You can also call Proformance race school at SIR as they have a few open track sessions on weekday afternoons.
There is also the Bremerton track which is used for autocross and road events.
Let it rip...
